CONCORD, N.C. -- Kurt Busch and sponsor Monster Energy will move to Chip Ganassi Racing next season for Busch's 20th season in NASCAR.

The partnership announced Tuesday is a one-year contract for Busch to drive the No. 1 Chevrolet with primary sponsorship from Monster. It is believed the one season as teammate to Kyle Larson will be Busch's final year of full-time NASCAR competition.

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The 2004 Cup champ's long-rumored departure from Stewart-Haas Racing is now official, but there are many other dominoes yet to fall during NASCAR's Silly Season.

During a teleconference Tuesday afternoon, Busch confirmed it was a one-year deal, but if things go well over the first half of 2019, he wouldn't rule out an extension.

"The way that everything has panned out with my switch from SHR to Ganassi Racing, I had always talked about 2019 and that being my 20th full-time year, that's the number I had in my mind," Busch said.

"But anytime you get an opportunity like this and seeing everybody on the shop floor this morning, you don't know what is around the next corner as far as motivation and challenges."

Busch's deal does not include a ride in the Rolex 24 At Daytona nor the Indianapolis 500 -- he has competed in both during his career -- although Ganassi didn't rule them out if sponsorship is found and if there are seats available in Ganassi's inventory.

"All that stuff is available," Chip Ganassi said. "All of our cars are available to all of our drivers. It's a matter if the opportunity presents itself. It's more than just me saying, "Let's do it' and him saying, 'Yeah, let's do it, I'm game.'

"For the two of us to decide is somewhat on a bit of an island when it comes to those type of things. The important point is those things are available for conversations. ... It's not often you have the guy who has the experience to do that."

Busch won NASCAR's Cup title in 2004 and counts the Daytona 500 and Coca-Cola 600 among his 30 career victories. He spent the past five seasons with Stewart-Haas Racing.

Busch will replace Jamie McMurray, who has driven for Ganassi in 13 of his 17 seasons at the Cup level. McMurray is expected to race in the Daytona 500 for Ganassi, and he's been offered a management role with the team.

Busch will be the first Cup driver in the 20-year history of the team to drive for Ganassi with a Cup title on his resume. Martin Truex Jr., who drove for the team in 2009, won the 2017 title.

"Ganassi's forward-thinking approach is why I have decided to commit all my years of Monster Energy Cup experience to CGR," Busch said. "Let's win."

Ganassi entered Cup racing in 2001 when he purchased a majority share of Sabco Racing, owned by Felix Sabates. Ganassi's racing organization has achieved its biggest success in IndyCar, where he has won five Indianapolis 500s. The organization celebrated its 200th win across all forms of racing when it won its class in the Rolex 24 At Daytona in January.

"We have had the good fortune of having a lot of great drivers here at Chip Ganassi Racing across all forms of racing, and Kurt Busch adds to that list of great drivers," Ganassi said. "He is a former NASCAR Cup Series champion and Daytona 500 winner and I believe still has a burning desire to win races and compete for a championship."